Administrative Code

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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 790. Sewage Collection and Treatment Regulations

9VAC25-790-210. Nonconventional methods, processes or equipment.

A. Policy. The policy of the department is to encourage the development of any new or nonconventional methods, processes, and equipment that appear to have application for the treatment or conveyance of sewage. Sewage treatment methods, processes, and equipment may be subject to a special permit application procedure if (i) they are not covered by the Manual of Practice (Part III (9VAC25-790-310 et seq.) of this chapter) and (ii) they are in principle, or application, deemed to be nonconventional.

B. Provisional CTO. The performance reliability of nonconventional processes and equipment shall have been thoroughly demonstrated through an approved testing program for similar installations (loadings of 75% or more of design level) before they may be considered for conventional approval and use. Where the department approves such a testing program, a provisional CTO will be issued for treatment works in which new or nonconventional processes and equipment are to be evaluated. The provisional CTO will specify conditions related to the testing requirements and agreements necessary for issuance of a final CTO. The owner of the facility shall submit the required test results to the department according to an approved schedule for approval prior to issuance of a final CTO. It is the owner's responsibility to operate in compliance with requirements imposed by permits issued for the sewerage system or treatment works.

C. Assurance resources. As a prerequisite to the issuance of a provisional CTO, the owner must furnish assurance of financial ability or resources available to modify, convert, or replace, the new or nonconventional processes or equipment in the event the performance reliability cannot be established over the period of time specified by the provisional CTO. These assurances may be in the form of funds placed in escrow, letters of credit, performance bonds, etc., which would revert to the facility owner if performance reliability cannot be established.

D. Performance reliability testing. All procedures used in testing of the performance reliability shall be conducted under the supervision of a licensed professional engineer who shall attest to the accuracy of sampling and testing procedures. The required samples shall be tested through a qualified laboratory. The testing program shall provide as a minimum the following:

1. Samples shall be collected at designated locations at a stated frequency and analyzed in accordance with provisions of the provisional CTO. The minimum testing period shall be 12 months under the comparable environmental and operational conditions for which the process and equipment will receive conventional approvals for any additional installations.

2. All analyses shall be made in accordance with the 19th Edition of Standard Methods for the Examination of Water and Wastewater (1995) and 40 CFR Part 136 as published in the 40 CFR July 1, 2023, update, or other approved analytical methods.

E. CTC. After the area engineer evaluates the plans and testing data, the director can issue a CTC if the performance data verifies that the method, process, or equipment can perform reliably in accordance with the design specifications and the operation standards of Part II, and that the method, process, or equipment may be installed as conventional for similar site specific operation.

F. Provisional CTO. Upon completion of construction or modification, a provisional CTO for a definite period of time will be issued for the operation of the nonconventional methods, processes, and equipment. Not more than one provisional CTO will be granted for a similar installation during the evaluation period. The provisional CTO shall require that:

1. The evaluation period shall be a minimum of 12 months and no longer than 18 months,

2. The holder of a provisional CTO must submit reports on operation during the evaluation period. The reports shall be prepared by either a licensed professional engineer experienced in the field of environmental engineering, the owner's operating or engineering staff, or a qualified testing firm.

G. Final CTO. The director will issue a final CTO upon lapse of the provisional CTO, if, on the basis of testing during that period, the new or nonconventional method, process, or equipment demonstrates reliable performance in accordance with permit requirements and the operation standards of Part II. If the standards are not met, then the owner shall provide for modification of the sewerage systems or treatment works, in a manner that will enable those standards to be met in accordance with this chapter.

Statutory Authority

§ 62.1-44.15 of the Code of Virginia; § 402 of the Clean Water Act; 40 CFR Parts 122, 123, 124, 403, and 503.

Historical Notes

Former 12VAC5-581-260 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-210, Virginia Register Volume 20, Issue 9, eff. February 12, 2004; amended, Virginia Register Volume 34, Issue 19, eff. June 13, 2018; Volume 40, Issue 14, eff. March 27, 2024.

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